\tracingonline=2
\tracingcommands=2
\tracingmacros=2
\tracingrestores=2

\catcode`{=1
\catcode`}=2

\hyphenation{ab-cd def-g}
\hyphenation{klmn-op}

%TODO
%\patterns{ab-cd def-g}
%\patterns{klmn-op}
\patterns{abcd defg}
\patterns{klmnop}

\end
